BFD: documentation

Change-Id: I06a23d24340c5527f3848177d2178bf3e55f7614
Signed-off-by: Klement Sekera <ksekera@cisco.com>
diff --git a/src/vnet/bfd/bfd_api.c b/src/vnet/bfd/bfd_api.c
index e64df48..185c03c 100644
--- a/src/vnet/bfd/bfd_api.c
+++ b/src/vnet/bfd/bfd_api.c
@@ -16,6 +16,10 @@
  * limitations under the License.
  *------------------------------------------------------------------
  */
+/**
+ * @file
+ * @brief BFD binary API implementation
+ */
 
 #include <vnet/vnet.h>
 #include <vlibmemory/api.h>